In order to reasonably select the proper suppliers for enterprises in China, this paper presents a supplier comprehensive evaluating index system through analysis of all kinds of factors. The method of data envelopment analysis, which has characteristics such as multi-input, multi-output and poly-objectives of the evaluated objects, is applied into the selection of suppliers and the model based on it is established. Through using this method, suppliers to be chosen are falling into two kinds: technical efficiency and technical inefficiency, which make an objective for enterprises to select. With analysis of a case study, the result shows the validity of the model in selecting suppliers.